Muscles - Lab Exam 3 Flashcards
Orbicularis Oris
Action: purses lips
Zygomaticus Major
Origin: Zygomatic bone
Insertion: Orbicularis oris
Action: Smile
Frontalis
Action: Raising Eyebrows
Orbicularis Oculi
Action: closes eye
Masseter
Origin: zygomatic arch
Insertion: angle of mandible
action: elevate mandible
Temporalis
Origin: temporal bone
Insertion: coronoid process of mandible
Action: elevates mandible
Sternocleidomastoid
Origin: manubrium, sternal end of clavicle
Insertion: mastoid process
Action: contralateral rotation of the head
Anterior Scalene
Action: Elevates 1st rib
Middle Scalene
Action: elevates 1st rib
Pectoralis major
Origin: sternum
Insertion: deltoid tuberosity
Action: flex and medially rotates shoulder
Pectoralis minor
Insertion: coracoid process of scapula
Action: protracts scapula
Trapezius
Origin: Spinous process of thoracic spine
Insertion: clavicle, acromion, spine of scapula
Action: elevate, retract, depress scapula
Latissimus dorsi
Insertion: intertubercular groove of humerus
Action: adducts arm
Erector spinae group
origin: sacrum, spinous process of lumbar vertebrae
Insertion: spinous process T1 - T2
Action: extends spine
Deltoid
Origin: acromial end of clavicle, acromion and spine of scapula
Insertion: deltoid tuberosity
Action: flex, extend, abduct arm
Supraspinatus
Origin: Supraspinous fossa
insertion: greater tubercle of humerus
Action: abducts arm
Infraspinatus
Origin: infraspinous fossa
Insertion: greater tubercle of humerus
Action: lateral rotation of arm
Teres minor
Origin: lateral border
Insertion: greater tubercle of humerus
Action: external rotation of arm
Teres major
origin: lateral border of scapula
Insertion: intertubercular groove of humerus
Action: extend, adduct, internal rotation of arm
Subscapularis
Origin: subscapular fossa
Insertion: lesser tubercle of humerus
Action: internal rotation, adduction of arm
Biceps Brachii
Origin: coracoid process of scapula
Insertion: radial tuberosity
Action: supination of forearm
Brachialis
Origin: distal humerus
Insertion: coronoid process of ulna
Action: elbow flexion
Triceps Brachii
Origin: posterior humerus
Insertion: olecranon process of humerus
Action: elbow extension
Forearm flexors
anterior group of muscles
Origin: medial epicondyle of the humerus
Insertion: lateral radius, carpals
Action: pronation of forearm, abduction of hand, flexes wrist
Forearms extensor
posterior group of muscles
Origin: lateral epicondyle of humerus
Insertion: metacarpals, carpals
Action: abduct and extends hand
Rectus abdominis
Origin: crest of pubis
Action: flexes abdomen
External oblique
Origin: ribs 5 - 12
Insertion: linea alba, inguinal ligament
Action: laterally compresses abdomen
Quadratus lumborum
origin: posterior border of iliac crest
insertion: rib 12, transverse process of lumbar vertebrae 1 - 4
Action: extension of spine
Psoas major
Insertion: lesser trochanter of femur
Action: flexion of the hip
Iliacus
Origin: iliac fossa
Insertion: lesser trochanter of femur
Action: flexes and medially rotates hip
Tensor fasciae latae
Origin: anterior superior iliac spine
Insertion: lateral knee, via iliotibial tract/band
Action: hip abduction, medial rotation
Gluteus maximus
Origin: posterior ilium
Insertion: gluteal tuberosity of femur
Action: extends hip and thigh
Piriformis
Origin: Sacrum
Insertion: greater trochanter
Action: lateral rotation of thigh
Biceps femoris
Origin: ischial tuberosity and linea aspera
Insertion: proximal fibula
Action: flex knee
Semitendinosus
Origin: ischial tuberosity
Insertion: proximal tibia
Action: flex knee
Semimembranosus
Origin: ischial tuberosity
Insertion: medial tibia
Action: flex knee
Rectus femoris
Origin: Anterior inferior iliac spine
Insertion: patella
Action: extend knee
Vastus lateralis
Origin: Greater trochanter, linea aspera
Insertion: patella
Action: extend knee
Vastus medialis
Origin: linea aspera
Insertion: patella
Action: extend knee
Vastus interemedius
Origin: anterior femur
Insertion: patella
Action: extend knee
Sartorius
Origin: Anterior superior iliac spine
Insertion: medial tibia
Action: flex, lateral rotation of thigh
Adductor Magnus
Origin: inferior ramus of pubis, ischial tuberosity
Insertion: linea aspera
Action: adduct thigh
Gastrocnemius
Origin: medial and lateral epicondyle of femur
Insertion: calcaneus
Action: Plantar flex foot
Soleus
Origin: Posterior tibia and fibula
Insertion: Calcaneus
Action: Plantar flex foot
Tibialis posterior
Origin: posterior tibia and fibula
Insertion: metatarsals 2-5, calcaneus
Action: inversion of foot
Fibularis longus
Origin: shaft of fibula
Insertion: metatarsal 1
Action: eversion of foot
Tibialis anterior
Origin: anterior tibia
Insertion: metatarsal 1
Action: dorsiflexion of foot
Flexor digitorum brevis
Origin: calcaneus. via plantar aponeurosis
Insertion: middle phalanx of digits 2 - 5
Action: flexes digits 2 - 5
